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Method for ammonia method desulfurization of flue gas and high-purity ammonium hydrogen sulfite by-producing

A technology of ammonium bisulfite and ammonia desulfurization, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as difficulty in meeting emission requirements, ammonia escape, etc.

Active Publication Date: 2012-09-12
水泽节(山东)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the high-concentration sulfur dioxide gas produced by burning secondary sulfur substances passes through the first-stage absorption tower, the concentration of sul

Method used

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  • Method for ammonia method desulfurization of flue gas and high-purity ammonium hydrogen sulfite by-producing
  • Method for ammonia method desulfurization of flue gas and high-purity ammonium hydrogen sulfite by-producing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Simulated flue gas composition: 78% N 2 , 3% O 2 , 15% SO 2 , 3% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7. The result is as follows:

[0017] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) NH 4 HSO 3 Solution concentration 1 58 32 75%

Embodiment 2

[0018] Example 2: Simulated flue gas composition: 78% N 2 , 3% O 2 , 12% SO 2 , 7% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7. The result is as follows:

[0019] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) NH 4 HSO 3 Solution concentration 1 65 28 70%

Embodiment 3

[0020] Example 3: Composition of simulated flue gas: 78% N 2 , 8 of O 2 %, 8% SO 2 , 5% CO 2 and water vapor. Flue gas flow: 1m 3 / min. The ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 6-7; the ammonia water and (NH 4 ) 2 SO 3 The pH value of the solution is 5-6. The result is as follows:

[0021] Flue gas flow rate (m 3 / min) SO after purification 2 Content (ppm) Purified NH 3 Content (ppm) NH 4 HSO 3 Solution concentration 1 58 62 72%

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Abstract

The invention discloses a method for ammonia method desulfurization of flue gas and high-purity ammonium hydrogen sulfite by-producing. The method comprises the following steps that: solid substances rich in sulfur are firstly burnt to generate the flue gas rich in high concentration sulfur dioxide gas; the flue gas enters into a cyclone separator for dedusting, and the dedusted flue gas enters into a heat exchanger for temperature reduction; then the flue gas enters into a washing and purifying tower to be washed; the flue gas respectively enters into a primary absorption tower, a secondary absorption tower and a third absorption tower for absorption, the high concentration ammonium hydrogen sulfite solution generated through reaction is taken out from a bottom groove of the primary absorption tower as a finished product for package; and the flue gas enters into a washing tower to discharge after washing. By the method, SO2 and other harmful acidic gas are highly purified; the utilization ratio of an ammonia absorption agent is effectively improved; high-purity ammonium hydrogen sulfite solution can be obtained; and the ammonium hydrogen sulfite solution has excellent special industrial use and prospect.

Description

technical field [0001] The invention relates to the technical field of preparing ammonium bisulfite by using the gas produced by the combustion of sulfur-rich substances, in particular to a method for ammonia desulfurization of flue gas and by-production of high-purity ammonium bisulfite. Background technique [0002] Ammonium bisulfite (NH 4 HSO 3 ) solution is an important industrial raw material, it is the raw material for producing liquid sulfur dioxide, hydrosulfite and hanging white block, and it is used as a reducing agent in the pharmaceutical industry. The common production method is to absorb the tail gas of acid production with ammonia water to obtain ammonium bisulfite solution. Its chemical reaction formula is: [0003] 2NH 3 +SO 2 +H 2 O→(NH 4 ) 2 SO 3 (1) ; [0004] (NH 4 ) 2 SO 3 +SO 2 +H 2 O→2NH 4 HSO 3 (2) . [0005] The tail gas discharged contains sulfur dioxide, and the tail gas from sulfuric acid production and the waste gas from t...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D47/06
Inventor 郭翠翠
Owner 水泽节(山东)环保科技有限公司
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